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        //函数翻转数组
        function reverse(arr) {
            var newarr = [];
            for (var i = arr.length - 1; i >= 0; i--) {
                newarr[newarr.length] = arr[i];
            }
            return newarr;
        }
        var arr1 = reverse([1, 2, 3, 4, 5]);
        console.log(arr1);

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